1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e6d460c18ec75a1397c17948bf8e9511a3d82a5baf1e6a8d92a0603f55c241. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a41fe7b0-b89c-4aff-a51c-df2837f40e18.json and https://artists.proofprofile.net/proofs/artist/a41fe7b0-b89c-4aff-a51c-df2837f40e18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4b2ea3d6f6c2bde89de9fbb184b80e5793364258b5d921918096b7fe1c9aa0. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB22352829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04d06778d7cb8594f5caff669eadad4c9165905cc16c35abac8d0725e0603ad. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ62416109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa844b8955daff1690be988d405bdfe234df19ddfe86e31880b790338bb6d8d67. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEN2454264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6cc23407a41dae93226a35d250d07a01164fa9c8fc5705217538c6ccc6752f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB42447231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207bfaa8a0e9c8fe5c472900081e9b3b670e3c77f53f7643916f3ea305596427. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTBB2487798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3402715854946a273430b29db2bdc37b26be1335630d2df1becf86ae6925dd0a. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7P2464623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7d560443580326bb9fb04442daac94d5bcb1db456e3079450559f863abff35. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7R2408423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaabfd70251f0e7fd6657448203f757a824db5e209f375aaed2fbae6d5829e49. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7T2424103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f17d221422c194616f285bff574953d42d21e221c0c709196512b06229dee4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYY2577540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a22976f3568d007c6b40c545cbd5c12d53465c88f040035fcfff9495403b79. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5BU2565971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16734f6efa0ec7cdc983a80e7b39543b467fea7772b783ec43ad132c00e53d2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN32509301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04eb49c4a98abb32c88159260f29ed4eafd586745027e4748dba9bd191d7096b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2535330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e98b0c9d08c8d4904c549f6897b2b68d1e0ce4eb58fca86eb8f4a9a2e924fe3. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPLS2575179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd503b0b3c43f4fb3bd72b6378eb5856f3ecd42effd6e85b5b845b99f03ab7f30. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7K2586479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95e94b0c56846e249dcc2aad5d99fd5d99f8c3cf32c5ed1ee42488fe89cf534. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7K2586697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87523abeb2dfd1928a69b2f6e00c5b0fc6ec89072d46ef7f77e64be47d1aa999. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZZ7P2543718.